How would you reason with a man that logically knows the Watchtower is
deceptive but still emotionally “supports” it because of his experiences while
in the organization?
Just how is he 'emotionally supporting' the WTS? Does he still attend meetings? Does he still go in service and place magazines? Does he still think it's "The Truth"?
If a person has come to see that the WTS has been "deceptive," willfully controlling and manipulating multiple generations of families for a hundred years--and does not have some degree of indignation--I submit they do not see the picture clearly. I'd ask...
"Do you know that if you decide you no longer recognize the WTS as the sole channel of communication from God--and admit as much to elders, without turning back--the organization will threaten all of your family members and friends not to speak to you, and will tell them you are a "wicked enemy of God," that they should "hate" you and not even pray for you?"
Just working with his admission that they are "deceptive," you could always use the example the Society has always used: "If in a whole glass of water, you knew there was just one drop of poison, would you drink it?" In line with this, here's a quote from the September 8, 1987 Awake!, (pages 10, 11.) Here the Watchtower Society makes the following appeal to members of other churches under the subheading: "If Your Church Fails to Act, Will You?”
“If, after making an honest investigation, you are less than pleased with what you see, do more than just complain. A journalist, while commenting on Karl Barth's statement that a church IS its members, logically concluded: 'Church members ... are responsible for what the church says and does.' So ask yourself: Am I willing to share responsibility for everything my church says and does? Can I really be proud of having all its members as spiritual brothers?”